ADC124S021CIMMX - 12-Bit 200kSPS 4-Ch SAR ADC | Texas Instruments
Teilenummer: ADC124S021CIMMX ✗ Abgekündigt| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.08 | $30,80 |
| 100 | $2.74 | $274,00 |
| 500 | $2.41 | $1.205,00 |
| 1.000 | $2.07 | $2.070,00 |
ADC124S021CIMMX Übersicht
SAR ADCs are a class of Nyquist-rate converters that perform a binary search against a precision DAC internal to the IC, producing a single conversion result per request at deterministic latency. They sit in the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. Compared to delta-sigma ADCs, SAR converters are preferred when the application needs wide bandwidth, single-shot acquisition, low latency, and synchronous sampling across multiple channels. Within TI's ADC portfolio, the ADC124S021 belongs to the low-power, multi-channel, <500 ksps SAR family.
Key features include 12-bit resolution with no missing codes, a 50 to 200 ksps guaranteed sample-rate range (clocked through a fixed SCLK-to-CONV ratio), four single-ended input channels multiplexed to a common ADC core, an external reference input, low power consumption (typically under 4 mW at 200 ksps), and an operating temperature range of -40°C to +85°C. The wide supply range (2.7 V to 5.25 V analog, 2.7 V to VDD digital) suits both 3.3 V and 5 V microcontroller families.
Technically, the device uses a charge-redistribution DAC with a sample-and-hold front end. Because the converter is specified across its full sample-rate window rather than at a single fCLK, designers can trade throughput for power. The serial interface uses CS, SCLK, DOUT, and DIN lines, with the ADC acting as a serial slave; multiple devices can share a bus by unique chip-select control. This simplifies multi-channel expansion beyond the four internal channels.
Typical applications include portable industrial data loggers, multi-sensor front ends, motor control feedback loops, battery-powered instrumentation, and medical point-of-care devices. Any 4-channel, low-to-medium speed, general-purpose digitization task with a serial interface fits this part. The wide -40°C to +85°C industrial temperature range also supports factory-floor and outdoor enclosures.
When laying out a PCB with this converter, place the reference bypass capacitor (typically 10 µF) close to the REF pin and keep the analog inputs short and guarded. Provide a clean low-noise analog supply; if the source impedance exceeds a few hundred ohms, add an input buffer because SAR ADCs draw transient current on the input capacitor during acquisition.
This page synthesizes distributor stock state, exact VSSOP-10 alternatives, and practical SAR layout guidance that the manufacturer datasheet alone does not aggregate in one place.
Drop-in-Alternativen für ADC124S021CIMMX – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ADC124S021CIMMX (gleiche Bauform und Footprint) – abweichend in Package, Architecture, Number of Channels, Input Type, Resolution.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
ADC124S021CIMMX/NOPB
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADC124S021CIMM
✅ Drop-In✓ Auf Lager
$3.78 / Stück
Datenblatt ansehen →ADC124S021CIMM/NOPB
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADC122S021CIMMX
✅ Drop-In✓ Auf Lager
$2.35 / Stück
Datenblatt ansehen →ADC124S051CIMM
✅ Drop-In✓ Auf Lager
$4.05 / Stück
Datenblatt ansehen →ADC084S021CIMMX
✅ Drop-In✓ Auf Lager
$1.6 / Stück
Datenblatt ansehen →ADC124S021CIMMX Grenzwerte & elektrische Eigenschaften
| Auflösung | 12 bit |
| Number of Channels | 4 input |
| Converter Type | SAR (Successive Approximation) |
| Sample Rate Range | 50 ksps to 200 ksps |
| Architecture | Single ADC with 4:1 input MUX |
| Supply Voltage (Analog) | 2.7 V to 5.25 V |
| Supply Voltage (Digital) | 2.7 V to VDD |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Reference Type | External (REF pin) |
| Betriebstemperatur | -40°C to +85°C |
| Gehäuse | 10-pin VSSOP (DGS) |
| Montageart | Surface Mount |
| MSL-Level | 1 (unlimited) |
| RoHS-Status | Non-compliant (original part; /NOPB variant is RoHS compliant) |
| Lead-Free | Contains lead (non-NOPB suffix) |
ADC124S021CIMMX Pin-Konfiguration
| Pin 1 | VA — Analog supply voltage |
| Pin 2 | VDD — Digital supply voltage |
| Pin 3 | GND — Ground |
| Pin 4 | REF — External voltage reference input |
| Pin 5 | IN0 — Analog input channel 0 |
| Pin 6 | IN1 — Analog input channel 1 |
| Pin 7 | IN2 — Analog input channel 2 |
| Pin 8 | IN3 — Analog input channel 3 |
| Pin 9 | DOUT — Serial data output (MISO) |
| Pin 10 | DIN/CS/SCLK — Serial data input, chip select, and serial clock (see datasheet for shared-pin function) |
Typische Anwendungen
ADC124S021CIMMX ist geeignet für 6 Anwendungs: Portable Industrial Data Logger, Multi-Sensor Industrial Front End, Brushless DC Motor Control Feedback, Battery-Powered Medical Device, Wireless Sensor Network Node, Test and Measurement Front Panel.
Portable Industrial Data Logger
The ADC124S021CIMMX is well suited to multi-channel portable data loggers where 12-bit resolution at up to 200 ksps across four sensor inputs is sufficient. Its 2.7 V to 5.25 V supply range allows direct battery or USB power, and the SPI-compatible serial interface minimizes microcontroller pin count. Place the device near the sensors to keep analog traces short, use a 10 µF REF bypass capacitor, and duty-cycle conversions to extend battery life by 2-4x versus continuous 200 ksps operation.
Empfohlen
Multi-Sensor Industrial Front End
In a 4-channel sensor aggregation board (temperature, pressure, flow, level), the ADC124S021CIMMX multiplexes four transducer outputs through one SAR core, eliminating external analog switches. Its 12-bit resolution provides 0.024% FS precision, suitable for instrumentation amplifiers followed by sensor signals in the 0-VREF range. Using an external TI REF5025 reference and a low-noise LDO such as TPS7A30 preserves SNR; SPI framing lets a host MCU sample at deterministic intervals without jitter.
Empfohlen
Brushless DC Motor Control Feedback
In BLDC motor control loops, the ADC124S021CIMMX digitizes phase current, bus voltage, and temperature feedback through its four single-ended inputs. The deterministic SAR latency allows fixed control-loop timing without the group delay of delta-sigma ADCs. Sampling at 100-200 ksps gives bandwidth well above typical 20 kHz PWM rates, while the 10-pin VSSOP package fits tightly on compact motor-driver boards. An external reference (REF5025) and short input traces maximize dynamic range.
Empfohlen
Battery-Powered Medical Device
For battery-powered medical point-of-care devices, the ADC124S021CIMMX offers 12-bit resolution at less than 4 mW typical consumption, ideal for portable diagnostic cartridges reading electrochemical or optical sensors. The 2.7 V minimum supply supports 3 V lithium primary cells. SPI framing reduces MCU pin count, leaving more GPIO for user I/O. Add a REF5025 reference and proper input guarding to meet IEC 61010 medical instrument creepage/clearance expectations.
Empfohlen
Wireless Sensor Network Node
In a wireless sensor node (e.g., 6LoWPAN, LoRa, Zigbee), the ADC124S021CIM four inputs at low duty cycle, then a sub-GHz radio transmits the packet. The ADC's 50 ksps minimum sample rate allows energy-aware sampling, and the SPI bus shares with the radio's SPI slave to save MCU pins. Battery life improves 3-5x compared to a continuously-sampling delta-sigma ADC, while 12 bits is sufficient for environmental monitoring. An external precision reference ensures repeatable calibration across nodes.
Empfohlen
Test and Measurement Front Panel
In bench-top test equipment and data acquisition modules, the ADC124S021CIMMX provides 12-bit, 4-channel digitization with deterministic latency, supporting accurate front-panel readout of voltage, current, and temperature. The SPI/QSPI/MICROWIRE interface is compatible with FPGA and DSP front ends common in instrumentation. Use the /NOPB RoHS variant for new designs and add an input protection TVS for hot-swap scenarios in production test fixtures.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ADC124S021CIMMX – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ADC124S021CIMMX/NOPB | ADC124S021CIMM | ADC124S021CIMM/NOPB | ADC122S021CIMMX | ADC124S051CIMM | ADC084S021CIMMX |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 10-VSSOP (DGS) | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 8 bit (-33%) | |
| Sample Rate (max) | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 500 ksps (+150%) | 200 ksps | |
| Input Channels | 4 single-ended | 4 single-ended | 4 single-ended | 2 single-ended (-50%) | 4 single-ended | 4 single-ended | |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | ||
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | ||
| Lifecycle Status | Obsolete (non-/NOPB) | Active (recommended) | Active | Active | Active | Active | |
| RoHS Compliance Compliance | Non-compliant (original) | Compliant (NOPB) | Compliant (NOPB) |
Wichtigste Unterscheidungsmerkmale
- Four channels in a 10-pin VSSOP package (vs. ADC122S021CIMMX)
- Active lead-free production part available on same footprint (vs. ADC124S021CIMMX (non-/NOPB))
- Specified across 50-200 ksps range, not single rate (vs. ADC084S021CIMMX)
Designhinweise
Estimated: at 200 ksps with 5 V analog supply, the ADC124S021CIMMX consumes roughly 4 mW (0.8 mA). Use a low-noise LDO such as TI's TPS7A30 (negative) or TPS7A47 (positive) to keep ripple below the ADC's PSRR floor at the SCLK harmonic frequencies. Decouple VA and VDD separately with a 10 µF + 100 nF pair each, placed as close as physically possible to the supply pins.
Place a 10 µF X7R ceramic bypass capacitor directly on the REF pin, with a 100 nF in parallel for HF noise; the reference settling time directly affects acquisition accuracy at 200 ksps. Keep analog input traces short and guarded with a ground plane on the layer beneath to minimize coupled digital noise. Route SPI traces (SCLK, DOUT, CS) away from the analog inputs and avoid running them parallel to clock edges.
Do not exceed the absolute maximum analog input voltage on IN0-IN3: voltages outside 0 V to VA during power-up will forward-bias the input ESD clamp and bias the sample capacitor, corrupting the first conversion after power-up. If driving the inputs from a source impedance above ~1 kΩ, add an op-amp buffer (e.g., OPA333) because SAR ADCs draw transient kickback current during acquisition; the buffer also isolates the ADC from sensor-source impedance variation.
Compliance-Informationen
Original ADC124S021CIMMX (no /NOPB) is non-RoHS due to lead finish. The /NOPB suffix variant is RoHS compliant. No AEC-Q100 automotive grade is offered in this family; for automotive SAR ADCs, see TI's ADS795x series.
